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In this paper, the distributions of electric field and electric displacement in a three-layer beam-like piezoelectric harvester are revisited from the accurate piezoelectricity theory. The electric displacement D3 is obtained from the Gauss theorem in electrostatics and found to be uniformly distributed along the thickness direction. The electric field is observed linearly dependent on x3. The efficiency...
Segmentation of Synthetic Aperture Radar (SAR) images is often only understood as the partitioning of the image into rather small regions which are homogeneous with respect to scattering processes. This paper proposes an adaption of the graph-cut image segmentation framework to the unique characteristics of polarimetric SAR images by using a Wishart-distribution based distance measure for local segmentation...
Formalizing requirements in formal specifications usually requires high skills for abstraction and experience in using the formal notation in which the specification is written. This poses a challenge to many practitioners who have to deal with realistic systems within the required schedule and budget. To handle this challenge, a pattern system has been proposed for computer-aided construction of...
A novel dual-band tandem coupler with an arbitrary coupling coefficient is proposed and experimentally proved in this paper. The coupler consists of a typical tandem coupler and an additional transmission line placed between the two pairs of coupled lines. The coupler has a simple structure and can realize arbitrary coupling coefficients over two designated frequencies. Design equations are derived...
The paper is dealt with the H2 fixed-lag deconvolution smoothing problem for linear systems. The problem is different from the standard H2 deconvolution filter or smoother, since the system is disturbed with multiplicative noises. Furthermore, multiplicative noises both occur in the system state equation and the observation equations. The H2 fixed-lag deconvolution smoother is given by solving Riccati...
This paper presents an in-depth modeling of a pressure-compensated flow control valve (PC valve) by making its physical meaning more understandable and analysable. Proper simplification is used to describe the internal principles of control laws. Theoretical analysis of the relation between the design parameter and the performance based on the valve model is described. The result of this method is...
It is noted that there isn't any handy approach to study the effect of damping hole to fuel metering valve at present, although the performance of a fuel metering valve is dramatically influenced by both damping hole and damping ratio. This paper presents a mathematical approach. Using this approach, it is convenient for designer to obtain the damping ratio's optimal value, lower and upper bounds,...
Fuzzy-PID control is used in the Variable rate fertilization controlling system and the rule of the fuzzy control is determined. Based on the dynamic model of the Variable rate fertilization controlling system, MATLAB/Simulink is applied to simulate the torque and the rotation speed of the engine. The experimental results indicate that the proposed method is of simple arithmetic and real-time characteristics...
Due to the complexity in structure and the various distortions in different styles of Chinese characters, it is more suitable to use a structural matching algorithm for computer recognition of Chinese characters. Relaxation matching is a powerful technique which can tolerate considerable distortion. In this paper, we apply a new relaxation matching technique to character recognition based on constraint...
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